.up{
  margin-left: 400px;
  margin-top: 50px;
}
.enlarge{
  margin: 0 auto;
}
.middle{
  width: 400px;
  height: 400px;
  border:1px solid #000;
  position: relative;
}
.middle>img{
  width: 400px;
  height: 400px;
}
.middle>.mask{
  width: 100px;
  height: 100px;
  background-color: rgba(255,255,0,.7);
  position:absolute;
  left: 0;
  top: 0;
  display: none;
}
.middle .big{
  width: 400px;
  height: 400px;
  position:absolute;
  left: 105%;
  top: 0;
  overflow: hidden;
  display: none;
}
/*
遮罩大小/中盒子大小 = 大盒子大小/大图的大小
*/
.middle .big>img{
  width: 1600px;
  height: 1600px;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 999;
}
.small img{
  width: 80px;
  height: 80px;
  margin:5px;
  border:3px solid #00f;
}
.small img.active{
  border-color:Red;
}
.mask:hover{
  cursor: move;
}


.fl{
  float: left;
}
.clear{
  clear: both;
}
.introduce{
  /* border: 1px solid black; */
  margin:  0 0 0 80px;

}
.down{
 float: right;
 width: 800px;
}

.title{
  font-size: 14px ;
  color: #666 ;
}
.price{
  font-size: 18px ;
  color: red ;
}
.qian{
  color: red ;
}
a{
  text-decoration: none;
}
